Mix well cream cheese, lemon juice, and lemon zest with a fork or spoon. Spread cream cheese mixture onto 4 bread slices on one side only. Spread Blueberry Jam onto one side of the remaining 4 bread slices. Press cream cheese slices together with jam slices to form 4 sandwiches. Beat the eggs and milk well. Dip Sandwiches into egg mixture until soaked on both sides. Drain slightly and place on a hot, buttered skillet and cook over medium heat until browned on both sides.